Four cylinder cars are generally easier to turbo rather than supercharge, as they typically don't make all that much power to begin with and so can't spare very much to lose turning the blower. V6 and V8 engines can, so they're more frequently used for supercharged applications. Don't get me wrong, though, turbos on 6 and 8 (and greater) cylinder motors make huge power as well. My buddy's '86 Saleen made 425rwhp/450rwtq on a non-intercooled T44 at 8 psi. 
Personally I've got a total hardon for turbos. I have a turbo Mustang and would love a turbo setup on the 4Runner. I much prefer turbo whistle and BOV hiss over blower whine, and the way turbos work just makes more sense and seems tougher to me. No, those are not scientific opinions, but that's how I feel. 
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--Brian
Truck - 1986 4Runner SR5 - 22RE, 5spd, 265K, 3" OME/BJ spacer lift, 31x10.50 TrXus MT's, satin black AR steelies, homemade bikini top
Car - 1995 Lexus SC400, red/black, 220K, coilovers, exhaust
Pickup - 1985 Toyota Xtra cab pickup - 2wd, 22R, 5spd, 270K miles, 4Runner buckets, currently two colors
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